US7293425B2 - Thermo siphon chiller refrigerator for use in cold district - Google Patents

Thermo siphon chiller refrigerator for use in cold district Download PDF

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Publication number
US7293425B2
US7293425B2 US10/514,110 US51411005A US7293425B2 US 7293425 B2 US7293425 B2 US 7293425B2 US 51411005 A US51411005 A US 51411005A US 7293425 B2 US7293425 B2 US 7293425B2
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Prior art keywords
heat exchanger
refrigerant
outdoor heat
thermo
passage
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Expired - Fee Related, expires
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US10/514,110
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US20050284169A1 (en
Inventor
Yoshihisa Tamura
Masataka Koyatsu
Akito Machida
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Mayekawa Manufacturing Co
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Mayekawa Manufacturing Co
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Assigned to MAYEKAWA MFG. CO., LTD. reassignment MAYEKAWA MFG. CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOYATSU, MASATAKA, MACHIDA, AKITO, TAMURA, YOSHIHISA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
    • F25B23/006—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect boiling cooling systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/02—Details of evaporators
    • F25B2339/024—Evaporators with refrigerant in a vessel in which is situated a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0401—Refrigeration circuit bypassing means for the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/01—Geometry problems, e.g. for reducing size
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/11—Fan speed control
    • F25B2600/111—Fan speed control of condenser fans
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to an energy-saving thermo-siphon chiller refrigerator which can perform a vapor compression refrigerating cycle (forced circulation cycle of refrigerant) in summer as a backup refrigerating cycle of the thermo-siphon chilling cycle (natural circulation cycle of refrigerant).
  • the air conditioning system generally used for air conditioning of a building is composed of, as shown in FIG. 2 , an outdoor heat exchanger 102 functioning as a condenser, a receiver 108 , an indoor heat exchanger 101 functioning as an evaporator, a compressor 110 , and an expansion valve 104 .
  • the system performs a vapor compression refrigerating cycle which is an energy consuming refrigerating cycle.
  • a natural refrigerant-circulation system is used as an energy-saving air conditioning system.
  • Said natural refrigerant-circulation system utilizes the phase-change of the refrigerant to effect natural circulation of the refrigerant based on the thermo-siphon principle caused by the effect of temperature difference of the refrigerant. By the system, energy saving and reduction of running cost are achieved.
  • the first embodiment of said proposal is, as shown in FIG. 3 , composed of an indoor heat exchanger 101 , an outdoor heat exchanger 102 , and a refrigerant piping 103 .
  • the indoor heat exchanger 101 is provided in a room for exchanging heat with the air in the room.
  • the outdoor heat exchanger 102 is provided in the outside of the separating wall A for changing heat with the outside air and located at the position higher than that of the indoor heat exchanger 101 .
  • the refrigerant piping 103 connects the indoor heat exchanger and outdoor heat exchanger so that the low boiling point refrigerant (HCFC-22, HFC-23) in the system circulates through the indoor heat exchanger 101 and outdoor heat exchanger 102 .
  • the low boiling point refrigerant enclosed in the refrigerant piping is heated in the indoor heat exchanger 101 by the heat of the air in the room to be boiled and evaporated.
  • the evaporated low boiling point refrigerant gas flows upward in the refrigerant pipe 103 and cools and dehumidifies the air passing through the indoor heat exchanger 101 .
  • the low boiling point refrigerant gas flew upward in said refrigerant piping is introduced into the outdoor heat exchanger 102 and thereby cooled by the outside air to be condensed to a liquid state.
  • the liquefied low boiling point refrigerant flows downward in the refrigerant piping by the effect of gravity to be again returned to the indoor heat exchanger 101 to be evaporated.
  • the evaporation condensing cycle is reiterated.
  • the characteristic of the proposed natural refrigerant-circulation chilling and dehumidifying apparatus is determined by the difference in specific gravity of the low boiling point refrigerant caused by the phase-change thereof, difference in height of the liquid column of the low boiling point refrigerant, refrigerant piping system, the characteristics of the indoor heat exchanger and outdoor heat exchanger.
  • the second embodiment of the natural circulation chilling and dehumidifying apparatus comprises an indoor heat exchanger 101 , an outdoor heat exchanger 102 , a refrigerant piping 103 , an expansion valve 104 , and a separate forced refrigerant-circulation refrigerating apparatus (a vapor compression refrigerating apparatus).
  • the vapor compression refrigerating apparatus 105 comprises an evaporation heat exchanger 150 , a condensing heat exchanger 151 , a compressor 152 , and an expansion valve 153 .
  • the evaporation heat exchanger 150 of the vapor compression refrigerating apparatus 105 is in close contact with the outdoor heat exchanger 102 in order to efficiently take away heat from the outdoor heat exchanger 102 .
  • Reference symbol A denotes a wall, the left side thereof being a room and the right side thereof being the outside.
  • said vapor compression refrigerating apparatus 105 is operated only when the temperature difference between the inside and outside of the room becomes small and cooling ability is reduced, in order to backup the heat exchanging ability of the outdoor heat exchanger 102 .
  • the third embodiment of the natural refrigerant-circulation chilling and dehumidifying apparatus consists of a vapor compression refrigerating/heat pumping apparatus 106 of prior art and the natural refrigerant-circulation chilling and dehumidifying apparatus 107 shown in FIG. 3 .
  • Said vapor compression refrigerating and heat pump apparatus 106 works on a conventional energy-consuming vapor compression refrigerating cycle and comprises an indoor heat exchanger 160 , an outdoor heat exchanger 161 , a compressor 162 , an expansion valve 163 , and a refrigerant piping 164 connecting them in a loop.
  • Reference symbol A denotes a wall, the left side thereof being a room and the right side thereof being the outside.
  • the compressor 162 is for compressing the low boiling point refrigerant filled in the system.
  • the refrigerating cycle and heat pump cycle can be switched to each other according to whether the compressed refrigerant gas is introduced to the outdoor heat exchanger 161 or to the indoor heat exchanger 160 .
  • the vapor compression refrigerating/heat pumping apparatus 106 is an air conditioning apparatus provided besides the natural refrigerant-circulation chilling and dehumidifying apparatus 107 .
  • the natural circulation of the refrigerant occurs sufficiently, energy-saving operation with the vapor compression refrigerating cycle operation stopped can be performed, or the heat pumping cycle operation of the vapor compression cycle to warm the room can be performed while dehumidifying by the operation of the natural refrigerant-circulation cycle.
  • the two systems work independently.
  • the second and third embodiments can accommodate enough to the environment, however, two sets of indoor heat exchangers, outdoor heat exchangers, and refrigerant pipe lines are necessary to be provided, and there is a problem of the high cost of equipment.
  • one of the two systems is the equipment for backing-up when outside temperature is high, so the utilization factor of the equipment is low and accordingly the investment efficiency is low.
  • the present invention is made in light of the problems of the prior art mentioned above, and the object is to provide a thermo-siphon chiller refrigerator for use in cold districts by joining a compressor, bypass piping, and switching valves to a natural refrigerant-circulation refrigerating system to enable the thermo-siphon chiller refrigerator to perform a vapor compression refrigerating cycle instead of a natural refrigerant-circulation cycle utilizing a part of the piping for the natural refrigerant-circulation cycle when outside temperature is high in summer.
  • thermo-siphon chiller refrigerator for use in cold districts comprising an outdoor heat exchanger functioning as a condenser, an indoor heat exchanger functioning as an evaporator located at a position lower than that of said outdoor heat exchanger, a compressor, and an expansion valve, characterized in that
  • thermo-siphon cycle i.e. a natural refrigerant-circulation cycle
  • thermo-siphon chiller refrigerator can accommodate to both high and low outside air temperatures.
  • the above invention is constituted such that, a compressor is joined to the conventional natural refrigerant-circulation refrigerating system comprising an outdoor heat exchanger functioning as a condenser, an indoor heat exchanger functioning as an evaporator and being located in a position lower than that of the outdoor heat exchanger, and refrigerant piping, and the compressor is connected to the outdoor heat exchanger and indoor heat exchanger to make it possible to perform vapor compression cycle by switching the path of refrigerant flow.
  • the refrigerant-flow path is switched to perform a vapor compression refrigerating cycle.
  • said indoor heat exchanger is of a flooded type evaporator, an evaporation pressure adjusting valve is provided downstream from the evaporator, and said outdoor heat exchanger is located so that the refrigerant outlet thereof is positioned higher than the liquid level of said flooded type evaporator.
  • the above invention defines that the indoor heat exchanger used for the thermo-siphon chiller refrigerator is a flooded type evaporator, and the evaporation pressure adjusting valve is provided downstream from the evaporator in order to accommodate to the change in outside air temperature.
  • the outdoor heat exchanger is positioned so that the condensed refrigerant liquid level therein is higher than the liquid level in the flooded type evaporator to enable natural circulation of the refrigerant.
  • said outdoor heat exchanger is of a air-cooled type condenser provided with a cooling fan of which the rotation speed is controlled by means of an inverter.
  • the outdoor heat exchanger used in the thermo-siphon chiller refrigerator is preferable to be an air-cooled condenser with a cooling fan of which the rotation speed can be controlled by an inverter motor in order to secure proper cooling ability of the condenser regardless of the change in outside air temperature.
  • an evaporation pressure adjusting valve is provided downstream from the indoor heat exchanger to adjust evaporation pressure in accordance with the variation of outside air temperature.
  • the natural circulation passage of refrigerant consists of a refrigerant vapor passage of larger diameter (thick pipe) and a refrigerant liquid passage of smaller diameter (thin pipe)
  • the forced circulation passage of refrigerant consists of a refrigerant vapor passage mainly consisting of said smaller diameter passage and a refrigerant liquid passage mainly consisting of said larger diameter passage, and the passages are combined by means of bypass passages.
  • refrigerant gas when operated by a natural refrigerant-circulation cycle, refrigerant gas flows through the thick pipe (larger diameter passage) and refrigerant liquid flows through the thin pipe (smaller diameter passage) in order to eliminate the influence of flow resistance in the natural refrigerant-circulation, and when operated by a vapor compression cycle (forced refrigerant-circulation cycle), refrigerant gas flows mainly through the thin pipe and refrigerant liquid flows mainly through the thick pipe. Therefore, lubricating oil accompanies the refrigerant gas flowing with large velocity in the thin pipe toward the condenser when the vapor compression refrigerating cycle is performed, and the lubricating oil can be returned to the compressor to ensure smooth operation of the compressor.
  • the passages are connected by bypass passages.
  • FIG. 1 is an illustration showing the schematic configuration of the thermo-siphon chiller refrigerator for use in cold districts according to the present invention.
  • FIG. 2 is an illustration showing the schematic configuration of the conventional vapor compression refrigerating equipment.
  • FIG. 3 is an illustration showing the first embodiment of the natural refrigerant-circulation chiller of the prior art.
  • FIG. 4 is an illustration showing the second embodiment of the natural refrigerant-circulation chiller of the prior art.
  • FIG. 5 is an illustration showing the third embodiment of the natural refrigerant-circulation chiller of the prior art.
  • FIG. 1 is an illustration showing the schematic configuration of the thermo-siphon chiller refrigerator for use in cold districts according to the present invention.
  • thermo-siphon chiller refrigerator for use in cold districts of the present invention constitutes, as shown in FIG. 1 , a natural refrigerant-circulation refrigerating cycle and a forced refrigerant-circulation refrigerating cycle (vapor compression refrigerating cycle), which can supply cold air of 7° C. when atmospheric temperature rises over a predetermined value in summer by the operation of the vapor compression refrigerating cycle.
  • a natural refrigerant-circulation refrigerating cycle and a forced refrigerant-circulation refrigerating cycle (vapor compression refrigerating cycle)
  • vapor compression refrigerating cycle vapor compression refrigerating cycle
  • thermo-siphon chiller refrigerator consists of a compressor 10 additionally installed to a natural refrigerant-circulation refrigerating system comprising an outdoor heat exchanger 12 functioning as an air-cooled condenser, an indoor heat exchanger 11 functioning as an evaporator located at a position lower than that of the outdoor heat exchanger 12 , and an expansion valve 18 and performs a vapor compression refrigerating cycle by driving said additional compressor when outside air temperature is high and the refrigerating capacity of the natural refrigerant-circulation refrigerating cycle is not sufficient.
  • Said natural refrigerant-circulation refrigerating cycle is made through an outdoor heat exchanger 12 which is an air-cooled condenser, an indoor heat exchanger 11 which is a flooded type evaporator located at a position lower than that of the outdoor heat exchanger 12 , an expansion valve 18 , a evaporation pressure adjusting valve 17 , switching valves 13 , 14 , 15 , 16 , and thick pipes (pipes larger in diameter) 21 a , 21 b , 21 c , 21 d (the diagonally shaded areas in FIG. 1 ), and thin pipes (pipes smaller in diameter) 25 c , 25 a , 25 b , 25 e , 25 f , 25 g (the solid lines in FIG. 1 ), the refrigerant flowing in the direction shown by arrows with broken line. Cold air of 7° C. cooled in the indoor heat exchanger by the evaporation therein of the refrigerant is supplied to the room.
  • the evaporation pressure adjusting valve 17 is located downstream from the indoor heat exchanger 11 , the valve being controlled to adjust the pressure in the evaporator in accordance with the change in outside air temperature.
  • the condensing capacity of the air-cooled condenser is properly secured regardless of outside air temperature through controlling the rotation speed of the cooling fan of the condenser by an inverter motor.
  • Said natural refrigerant-circulation refrigerating cycle is switched to said vapor compression refrigerating cycle when the refrigeration by the natural refrigerant-circulation refrigerating cycle is deficient because of high outside air temperature in summer.
  • the vapor compression refrigerating cycle is made through the additional compressor 10 , outdoor heat exchanger 12 , expansion valve 18 , indoor heat exchanger 11 , switching valves 16 , 14 , 15 , 13 , thin pipes 25 h , 25 b , thick pipes 21 d , thin pipe 25 c , thick pipe 21 c , and thin pipes 25 f , 25 g , the refrigerant flowing in the direction indicated by arrows with solid line.
  • Cold air of 7° C. cooled in the indoor heat exchanger by the evaporation therein of the refrigerant is supplied to the room.
  • the refrigerant gas produced by the evaporation of the refrigerant in the indoor heat exchanger 11 is compressed by the compressor 10 to high-pressure, high-temperature refrigerant gas to be fed under pressure from the compressor 10 to the outdoor heat exchanger 12 through the thin pipe 25 h , switching valve 16 , thin pipe 25 b , switching valve 14 , and thick pipe 21 d , and condensed in the air-cooled condenser.
  • the condensed liquid refrigerant flows to the indoor heat exchanger 11 which is a flooded type evaporator through the thin pipe 25 c , switching valve 15 , thick pipe 21 c , switching valve 13 , thin pipe 25 f , expansion valve 18 , and thin pipe 25 g to be evaporated there to cool the room air to 7° C.
  • the present invention provides an energy-saving and low-cost thermo-siphon chiller refrigerator for use in cold districts by joining a compressor, bypass piping, and switching valves to a natural refrigerant-circulation refrigerating system to enable the thermo-siphon chiller refrigerator to perform a vapor compression refrigerating cycle instead of a natural refrigerant-circulation cycle, utilizing a part of the piping for the natural refrigerant-circulation cycle, when outside temperature is high in summer.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
US10/514,110 2002-05-13 2003-05-13 Thermo siphon chiller refrigerator for use in cold district Expired - Fee Related US7293425B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002-137511 2002-05-13
JP2002137511A JP4018443B2 (ja) 2002-05-13 2002-05-13 寒冷地対応サーモサイホンチラー冷凍機
PCT/JP2003/005935 WO2003095906A1 (fr) 2002-05-13 2003-05-13 Refrigerateur a appareil frigorifique a thermosiphon prevu pour etre utilise dans le secteur froid

Publications (2)

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US20050284169A1 US20050284169A1 (en) 2005-12-29
US7293425B2 true US7293425B2 (en) 2007-11-13

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US (1) US7293425B2 (da)
EP (1) EP1505357B1 (da)
JP (1) JP4018443B2 (da)
CA (1) CA2485757C (da)
DE (1) DE60324136D1 (da)
DK (1) DK1505357T3 (da)
WO (1) WO2003095906A1 (da)

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US9845981B2 (en) 2011-04-19 2017-12-19 Liebert Corporation Load estimator for control of vapor compression cooling system with pumped refrigerant economization
US9915453B2 (en) 2012-02-07 2018-03-13 Systecon, Inc. Indirect evaporative cooling system with supplemental chiller that can be bypassed
US10739024B2 (en) 2017-01-11 2020-08-11 Semco Llc Air conditioning system and method with chiller and water

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JP2009193244A (ja) * 2008-02-13 2009-08-27 Hitachi Plant Technologies Ltd 電子機器の冷却システム
US20100242532A1 (en) * 2009-03-24 2010-09-30 Johnson Controls Technology Company Free cooling refrigeration system
US8219362B2 (en) 2009-05-08 2012-07-10 American Power Conversion Corporation System and method for arranging equipment in a data center
JP5800894B2 (ja) 2010-05-27 2015-10-28 ジョンソン コントロールズ テクノロジー カンパニーＪｏｈｎｓｏｎ Ｃｏｎｔｒｏｌｓ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏｍｐａｎｙ 冷却塔を有する冷却装置のための熱サイフォン冷却器
US8688413B2 (en) 2010-12-30 2014-04-01 Christopher M. Healey System and method for sequential placement of cooling resources within data center layouts
US9618254B2 (en) * 2011-07-21 2017-04-11 Lg Electronics Inc. Refrigerator
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US10156385B1 (en) 2017-08-15 2018-12-18 Christopher Kapsha Multistage refrigeration system
CN108571791B (zh) * 2018-04-28 2020-12-11 北京百度网讯科技有限公司 一种空调系统及其制冷方法
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EP1505357B1 (en) 2008-10-15
DK1505357T3 (da) 2009-01-12
US20050284169A1 (en) 2005-12-29
DE60324136D1 (de) 2008-11-27
WO2003095906A1 (fr) 2003-11-20
CA2485757A1 (en) 2003-11-20
JP4018443B2 (ja) 2007-12-05
EP1505357A4 (en) 2006-08-23
JP2003329317A (ja) 2003-11-19
CA2485757C (en) 2011-07-12

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